Improvement in locks



y L. BENSEL.

Lock.

No. 216,502. Patented June-17,1879.

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LUDWIG BENSEL, OF ISERLOHN, PRUSSIA, GERMANY.

IMPROVEMENT IN LOCKS.

Specification forming part of Letters Patent No. 216,502, dated June 17,1879 application filed March 14, 1879.

To all whom it may concern- Be it known that I, Lunwre BENSEL, ofIserlohn, Prussia, in the Empire of Germany, have invented a new andImproved Lock for Doors, Drawers, &c., of which the following is aspecification.

Figures 1, 2, 3, 4, 5, 6, 7, and 8 are face views of locks containing myinvention in several modifications. Fig. 9 is an end view of the lockillustrated in Fig. 5; Fig. 10, an end view of the lock illustrated inFig.4. Fig. 11 is a detail side view of the pin for locking the latchFigs. 12, 13, and 14, views of keys that may be used in the locks.

Similar letters of reference indicate corresponding parts in all thefigures.

The object of this invention is to produce a lock for doors, drawers,desks, piano-fortes, and the like, in which look no spring shall beemployed, but which shall, nevertheless, be positive in its action, anddifficult to pick or open except in the prescribed manner.

The invention consists in the new arrangement, and also in the newcombination, of parts hereinafter more fully described. In theaccompanying drawings, with particular reference to Fig. 4, the letter Trepresents the sliding bolt, placed into an appropriate lock-case, a,within which it is to be moved by a suitable key, such as shown in Fig.13. The bolt 1 has a straight slot, 0, and a U-shaped slot, b. Animmovable pin, 0, extends through the slot 0. By the pin 0 is pivotedwithin the lock-case a tumbler-plate, e, which carries a pin, 8, thatextends through the slot 1). The plate 6 is in front of the key-hole,and is cut out so that the key may enter it, and may swing it on itspivot 0 before the bolt can be moved. f is the 'latch, being a platethat is pvioted at 19 within the lock-case, and capable of be-' ingvibrated by turning a suitable handle, (1, from which a tongue, i, mayextend into a recess of the plate f, for moving it, as in Figs. 4 and 5,or which may directly connect with the plate f, as ,in Fig. 3. Atoe-piece, g, extends from the plate f and bears upon the plate 6, toassist the operation of the latter by the weight of the plate f.

The operation is as follows: When the bolt 1" is to be locked the key isinserted and turned.

Its first action will be to turn the plate 0 on its pivot, and tothereby carry the pin 8 into the horizontal part of the slot 1). Thebolt is now free to be moved by the key, which enters a recess in thebolt for this purpose. As soon as the bolt is shot out and the keywithdrawn, the pin 8 drops, by the weight of the plate 6 and upperplate, f 9, into the inner upright wing of the slot b, and thereby locksthe bolt, which cannot be drawn back again until the key has again swungthe plate 6 and carried the pin 8 into line with the horizontal part ofthe slot 1).

The latch can be freely worked by its handle d, whether the bolt 1" beopened or closed; but by inserting a pin, 1, directly over or againstthe latch through a hole, m, of the lock-case, the latch is.locked down,and thereby, also, the plate e, so that neither latch nor bolt can bemoved until the pin 1 be first withdrawn.

The invention as described is fully shown in Figs. 3, 4, and 5, whichdiffer simply in showing modified forms of plate f g and plate 0. In allthese cases the operation is exactly alike.

In Fig. 1 is shown a modification, which consists in rigidly uniting thelatch fto the plate e, so that the pin d will be the pivot of 6;otherwise the operation isalike, the slot b being, in the plate 0,H-sl1aped,to permit the free use of the latch.

In Fig. 2 is shown another modification, in which the plates e and f areentirely dispensed with, the bolt 1" having the slots 0 and b, as inFig. 4, and vibrating on the pin 0 until it can slide on both pins 0 and8. An arm, g, projecting from the bolt rests on the".latch-pin, and byits means the bolt can be freely used as a latch whenever desired.

In Figs. 6, 7, and 8 are shown the bolt 9' and plate 0, substantially asin Fig. 4, but without the latch mechanism, these kinds of locks beingintended for desks, pianos, drawers, &c.

The modification shown in Fig. 7 employs a separate guide-pin, a, in theslot 0 of the lee, hereinabove described. One of the upright arms of theslot 1) may be dispensed with in this modification.

I claim- 1. The combination of the pivoted plate 6, cut out foradmitting the key, and provided with the locking-pin 8, working in slot1), with the sliding plate or bolt 1', having slots 0 and I), and apivot-pin for the plate 6, substantially as herein shown and described.

2. The combination of the pivoted cut-out plate 6, having pin 8 andslotted bolt 7, with the latch f,' having pendant g, in contact withplate 0, substantially as herein shown and described.

3. The combination of the locking-pin l with the latch f, pivoted plate6, and slide-bolt 1',

so that the latch and the bolt may be locked by means of the pin l,substantially as herein shown and described.

4. The bolt 1", having straight slot 0 and U- shaped slot 11, incombination with the pin 0 and the pivoted plate 6, having pin 3,substantially as herein shown and described.

This specification signed by me this the 13th day of December, 1878.

LUDWIG BENSEL. Witnesses:

CARL HERTERBERG, CARL MiiLLER.

